<?php
require_once 'db_conn.php';
header("content-type:text/html;charset=utf-8");
$id = $_POST['id'];
$id = intval($id);

$username = $_POST['username'];
$sex = $_POST['sex'];
$message = $_POST['message'];
$imgurl = $_POST['imgurl'];
$time_at = time();

$sql = "
    UPDATE  `bbs`.`t_message` 
    SET  
    `username` =  '$username',
    `sex` =  '$sex',
    `content` =  '$message',
    `avater` =  '$imgurl',
    `$time_at ` =  '$time_at'
    WHERE  `t_message`.`id` = $id;
        ";
$result = $conn->query($sql);
print_r($result);